/**
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements.  See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership.  The ASF licenses this file to you under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with the License.  You may obtain
 * a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package org.apache.zookeeper.server.quorum.flexible;

import java.util.HashSet;

//import org.apache.zookeeper.server.quorum.QuorumCnxManager;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * This class implements a validator for majority quorums. The 
 * implementation is straightforward.
 *
 */
public class QuorumMaj implements QuorumVerifier {
    private static final Logger LOG = LoggerFactory.getLogger(QuorumMaj.class);

    int half;

    /**
     * Defines a majority to avoid computing it every time.
     *
     * @param n number of servers
     */
    public QuorumMaj(int n) {
        this.half = n / 2;
    }

    /**
     * Returns weight of 1 by default.
     *
     * @param id
     */
    @Override
    public long getWeight(long id) {
        return (long) 1;
    }

    /**
     * Verifies if a set is a majority.
     */
    @Override
    public boolean containsQuorum(HashSet<Long> set) {
        return (set.size() > half);
    }

}
